The three-dimensional calculation model of the urban express rail train running through rectangular tunnel is established, the non-continuous grid and the dynamic mesh are applied to simulate the dynamic process of the urban express rail train running through rectangular tunnel. The three-dimensional, incompressible and unsteady N-S equation is used to consider the relative motion between the moving express rail train and the stationary tunnel. In the three working conditions of 100 km/h, 130 km/h and 160 km/h, the changing law of air resistance and the changing law of pressure on carbody surface from the time when the train enters tunnel to the time when the train goes completely out of the tunnel are calculated and researched. The calculation result shows that the changing amplitudes of the aerodynamic resistance and the pressure on carbody surface get bigger with the increase of running speed.%建立了都市快轨列车穿越矩形隧道的三维计算模型,应用不连续网格和动网格来模拟快轨列车穿越隧道的动态过程.采用三维、不可压缩、非定常的N-S方程考虑移动的快轨列车与固定的隧道之间的相对运动.在100 km/h、130 km/h和160 km/h 3种速度工况下,计算研究了列车从进入隧道直至完全驶出隧道的气动阻力变化规律和车体表面压力变化规律.计算结果表明,随着运行速度的增大,列车的气动阻力及车体表面压力变化幅值均增大.
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